NCP5211A Datasheet, PDF (1/16 Pages) ON Semiconductor – Low Voltage Synchronous Buck Controller

NCP5211A
Low Voltage Synchronous
Buck Controller
The NCP5211A is a low voltage synchronous buck controller. It
contains all required circuitry for a synchronous buck converter using
external N−Channel MOSFETs. High current internal gate drivers are
capable of driving low R_DS(on) NFETs for better efficiency. The
NCP5211A is in a 14 pin package to minimize PCB area.
The NCP5211A provides overcurrent protection, undervoltage
lockout, soft start and built in adaptive nonoverlap. The NCP5211A is
adjustable over a frequency range of 150 kHz to 750 kHz. This gives
the designer more flexibility to make efficiency and component size
compromises. The NCP5211A will operate on a single supply or a
separate boost supply.
Features
• Switching Regulator Controller
− N−Channel Synchronous Buck Design
− 1.0 Amp Gate Drive Capability
− 200 ns Transient Response
− Programmable Operating Frequency of 150 kHz−750 kHz
− 0.8 V 1% Internal Reference
− Lossless Inductor Sensing Overcurrent Protection
− Cycle−by−Cycle Short Circuit Protection
− Programmable Soft Start
− 40 ns GATE Rise and Fall Times (3.3 nF Load)
− 70 ns Adaptive FET Nonoverlap Time
− Differential Remote Sense Capability
• System Power Management
− Operation with a Conversion Rail of 5.0 V or 12 V
− Undervoltage Lockout
− On/Off Control Through Use of the COMP Pin
− Max Duty Cycle Clamped to 70% for Forward Converter Control
Applications
• Set Top Devices
• Forward Converters
• Buck Converters
• Point of Load Regulation
http://onsemi.com
SOIC−14
D SUFFIX
CASE 751A
MARKING
DIAGRAM
14
NCP5211A
BWLYWW
1
B = Assembly Location
WL = Wafer Lot
Y = Year
WW = Work Week
PIN CONNECTIONS
1
GATE(H)
BST
LGND
V_FFB
V_FB
COMP
SGND
PGND
GATE(L)
V_C
IS+
IS−
V_CC
R_OSC
ORDERING INFORMATION
Device
Package
Shipping†
NCP5211AD
SO−14
55 Units/Rail
NCP5211ADR2 SO−14 2500 Tape & Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
© Semiconductor Components Industries, LLC, 2003
1
December, 2003 − Rev. 3
Publication Order Number:
NCP5211A/D